News & Updation
DUAL TONE MULTI-FREQUENCY (DTMF) ENABLED AUTOMATIC ACCESS CONTROL SYSTEM
Okeke R. O.* and Okoroigwe U. N.
Traditionally, most doors are controlled by manually unlocking, opening and closing them. With time, this method seems to be very strenuous, especially for garage doors as one have to alight from their vehicle to manually operate the door each time; for both opening and closing. As the world gets more technologically advanced, we find new technologies that help us carry out simple tasks more easily. This report details a new method of opening and closing garage doors with the use of a DTMF cell phone remotely, which is more convenient than traditional methods. In this proposed system, operation of the garage door was done by using a mobile phone. The keypad of a mobile phone was used to signal a DTMF decoder interfaced to a micro-controller system which in turn is connected to the mechanism that opens or closes the garage door, provided the correct pass-code was entered. This is based on the concept of Dual Tone Multi-Frequency (DTMF). The buttons on the keypad of the mobile phone generates a unique frequency when pressed. These frequencies were decoded by the DTMF decoder at the receiving end which is fed to the ATMEGA328 micro-processor. When this decoded values match with the values stored in the micro-controller, the micro-controller initiates a mechanism to open the door through a motor driver connected to the garage door. This method of operating garage doors has proven to be more convenient, making the task easier.[Full Text Article]